General post-processing function for plots

[AngelaKTE]

Write a general function to transform dataframe zero to newdataframe for a specific plots.

Context:
When running the cadCAD we'll produce a dataframe ("dataframe zero") that will always have the same structure:

• per timestep (=rows)
  columns:
• a) token_a_balance...
• b) token_b_balance ...etc
• c) token_a_weight
• d) token_b_weight...etc
• e) token_a_denorm_weight
• f) token_b_denorm_weight...etc
• g) generated_fees
• h) pool_shares
• i) token_a_value
• j) token_b_value...etc

---

After this step we'll create various plots, like comparing total TVL with liquidity (total number of tokens in the pool).

So the general procedure is:
take dataframe zero and create a newdataframe (e.g. named "c191) for simulation C1.9.1 in the notebook based on it:

• compute TVL: take token_a_value+token_b_value...etc; and create a new column (TVL) to add TVL for every timestep(row)
• compute liquidity: take token_a_balance+token_b_balance...etc; and create a new column(liq) to add liquidity for every timestep

and then plot a chart using newdataframe values: